4. Period costs a. b. c. d. are selling costs and administrative costs. are used to compute product cost. can be included in manufacturing overhead costs. are carried in inventory until the goods are sold. 5. What determines the difference between a direct and an indirect cost? a. Whether it can be easily traced to a specific cost object. b. Whether it is relevant to a particular decision. c. Whether it changes when activity levels change. d. Whether it is related to manufacturing or nonmanufacturing activities. . Within the relevant range, the difference between variable costs and fixed costs is: a. both total variable costs and total fixed costs are constant. b. both total variable costs and total fixed costs fluctuate c. variable costs per unit are constant and fixed costs per unit fluctuate. d. variable costs per unit fluctuate and fixed costs per unit remain constant